    package com.ruoyi.web.controller.common;

    import java.awt.image.BufferedImage;
    import java.io.IOException;
    import java.util.concurrent.TimeUnit;
    import javax.annotation.Resource;
    import javax.imageio.ImageIO;
    import javax.servlet.http.HttpServletResponse;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.util.FastByteArrayOutputStream;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    import com.google.code.kaptcha.Producer;
    import com.ruoyi.common.config.RuoYiConfig;
    import com.ruoyi.common.constant.CacheConstants;
    import com.ruoyi.common.constant.Constants;
    import com.ruoyi.common.core.domain.AjaxResult;
    import com.ruoyi.common.core.redis.RedisCache;
    import com.ruoyi.common.utils.sign.Base64;
    import com.ruoyi.common.utils.uuid.IdUtils;
    import com.ruoyi.system.service.ISysConfigService;

    /**
     * 验证码操作处理
     *
     *
     */
    @RestController
    public class CaptchaController
    {
        @Resource(name = "captchaProducer")
        private Producer captchaProducer;

        @Resource(name = "captchaProducerMath")
        private Producer captchaProducerMath;

        @Autowired
        private RedisCache redisCache;

        @Autowired
        private ISysConfigService configService;

        /**
         * 生成验证码
         */
        @GetMapping("/captchaImage")
        public AjaxResult getCode(HttpServletResponse response) throws IOException
        {
            AjaxResult ajax = AjaxResult.success();
            boolean captchaEnabled = configService.selectCaptchaEnabled();
            ajax.put("captchaEnabled", captchaEnabled);
            if (!captchaEnabled)
            {
                return ajax;
            }

            // 保存验证码信息
            String uuid = IdUtils.simpleUUID();
            String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

            String capStr = null, code = null;
            BufferedImage image = null;

            // 生成验证码
            String captchaType = RuoYiConfig.getCaptchaType();
            if ("math".equals(captchaType))
            {
                String capText = captchaProducerMath.createText();
                capStr = capText.substring(0, capText.lastIndexOf("@"));
                code = capText.substring(capText.lastIndexOf("@") + 1);
                image = captchaProducerMath.createImage(capStr);
            }
            else if ("char".equals(captchaType))
            {
                capStr = code = captchaProducer.createText();
                image = captchaProducer.createImage(capStr);
            }

            redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
            // 转换流信息写出
            FastByteArrayOutputStream os = new FastByteArrayOutputStream();
            try
            {
                ImageIO.write(image, "jpg", os);
            }
            catch (IOException e)
            {
                return AjaxResult.error(e.getMessage());
            }

            ajax.put("uuid", uuid);
            ajax.put("img", Base64.encode(os.toByteArray()));
            return ajax;
        }
    }
